Quoting WoutK89: "50/1.2 --> D7000 (minimally) for sure. You can register the lens and use it with metering."
Yes, according to a chart I found, at Ken Rockwell's site, the D7000, alone among the D+four-digit models, and D200 or newer among the D+three-digit models, will allow matrix metering, by entering lens data in a menu. Many of the better film models will also meter, and the FM3a has my attention.
The Novoflex adaptor will cost me nearly $300 US, and I have observed nice pre-owned D200 cameras selling for around $600, and I saw a D300 listed for just over $1000 US. Therefore, I am contemplating adding Nikon, but not abandoning Canon. My 7D is just too good to abandon.
My other option is to set the 1.2 aside for a quite long time, until I can afford a D700, which to me, handles quite well compared to the Canon 5D Mark II. For a while now, I have figured that when I move to full frame, I will likely go with Nikon.
As for manual focus, when shooting at night, I often have to focus manually, anyway, as it is. It does tend to make one pay attention to composition! I bought the 1.2 for night shooting.
Canon 7D2/7D/5D/40D/1D2N/M3; Nikon F6/D700/FM3A/1Dx/Coolpix A; Canon 40mm 2.8 STM, 135L, 50L, 35L, 50mm 1.8 I, 100mm 2.8L Macro, 10-22mm EF-S, 400mm 5.6L; Nikkor 50mm 1.2 AI-S, 50mm 1.4G, 50mm 1.8D, 16mm 2.8D Fisheye, 180mm 2.8D, 100-300mm 5.6 AI-S, 18mm 2.8D, 45mm 2.8 AI-P, 14-24mm 2.8G, 24-70mm 2.8G, Micro-Nikkor 60/2.8G; Voigtlander 90mm f/3.5 SL II